[Webkit-unassigned] [Bug 93643] Preserve styling elements in DeleteSelectionCommand

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=93643





--- Comment #44 from Darin Adler <darin at apple.com>  2012-08-14 16:40:45 PST ---
(From update of attachment 158424)
View in context: https://bugs.webkit.org/attachment.cgi?id=158424&action=review

> Source/WebCore/editing/DeleteSelectionCommand.cpp:426
> +    for (Node* node = range->firstNode(); node && node != range->pastLastNode(); node = node->traverseNextNode()) {

It’s not safe to point to a node with a raw pointer while editing a document. Mutation events could run and cause the node to be deleted. So you need the node to be a RefPtr<Node>.

> Source/WebCore/editing/DeleteSelectionCommand.cpp:430
> +            RefPtr<Node> clone = node->cloneNode(true);
> +            clone->setParentOrHostNode(0);
> +            appendNode(clone, head);

You should not have to clone the node. Instead you should do a removeNode followed by an appendNode to undoably move the node.

However, doing that also requires changing the way you walk from each node to the next. Before removing a node you need to call traverseNextSibling to advance to a node that won’t be removed.

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